Partial Discharge Detection Technology And Application Research Of Substation Composite Electric Apparatus(GIS)

With the continuous improvement of substation maintenance strategy,GIS partial discharge live detection technology has also been widely used in power systems,but the on-site detection technology is just moving towards the practical stage.With the continuous development of detection technology and the improvement of lean management,the development and application of on-the-spot detection technology also have some limitations and limitations.Therefore,it is of great significance to study the effectiveness of partial discharge charged detection of GIS equipment.In the field operation,GIS has a variety of partial discharge types,and the PD signal band is also very wide.Therefore,it is necessary to design a device that can accurately measure the PD signal and determine the cause of the fault and the location of the fault.Under the action of electric field,only partial discharge occurs in the running power equipment,but it does not penetrate through the conductor of applied voltage,that is,no breakdown.This phenomenon is called partial discharge.Partial discharge is caused by local electric field distortion and local field intensity concentration,which results in gas discharge or breakdown in the local range of insulating medium.Partial discharge will cause serious harm to the insulation of electrical equipment,mainly due to the local heat produced by the discharge,the impact of charged particles,the damage of chemical active products and rays to insulation materials.This paper mainly studies the application of partial discharge detection technology in practical engineering,mainly using ultra-high frequency and ultrasonic detection method to realize local emission location.This detection method is helpful to improve the accuracy of local emission positioning.It is necessary to obtain the ultra-high frequency data,acoustic emission data and high-frequency current data generated by local radio signals when combining acoustic and electrical techniques to locate the local discharge power of GIS.Through the comparison and analysis of the above data,the interference signal is eliminated.Determine the location and defect type of the partial discharge power supply.Finally,based on the examples of partial discharge electrification detection in three substations,the phenomenon of partial discharge occurred in its internal structure,insulation materials and other aspects is studied,which mainly involves the detection principle,operation flow,data analysis,and so on.At the same time,through the analysis of practical cases,the defect hidden trouble can be checked in time to provide guidance for the stability and safety of daily operation of GIS equipment in electric power enterprises in China.